Clamp.



F. H. ROBINSON.

CLAMP.

APPLICATION FILED APR. \3. 1915.

Patented Sept. 5, 1916.

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CLAMP.

Specification of Letters Patent.

Patented Sept. 5, 1216.

Application filed April 13, 1915. Serial No. 21,086.

T all whom it may concern Be it known that I, FRANK H. ROBINSON. a citizen of the United States, residing at Glendale, in the county of Los Angeles and btate of California, have invented certain new and useful Improvements in Clamps; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to new and useful improvements in clamps, and has for its principal object to provide a clamp which is particularly adapted for making quick adjustments.

Another object of the invention is to provide a clamp which may be easily locked in place after having once been adjusted to the desired size.

further object of the invention is to provide a clamp having a smooth surface against which the material being held rests.

Vith these and other objects in view, the invention consists in the novel combination and arrangement of parts which will be fully set forth in the following specification and accompanying drawings, in which,

Figure 1 is a top plan view of a clamp constructed in accordance with this invention, Fig. 2 is a longitudinal sectional view taken on line 22 of Fig. 1, and Fig. 3 is a vertical sectional view taken on line 3-3 of Fig. 2.

Referring to the drawings by characters of reference, the numeral 1 designates as an entirety the upper member of the clamp comprising the body 2, having formed at one end the jaw 3. A suitable enlargement 4 is formed at the same end of the body and extending downwardly from the lateral edges of the enlargement are the arms 5 which are formed at their lower ends with the connecting bar 6, which bar forms a guide for the lower section which will be more fully hereinafter described. Formed in the body 2 near the jaw 3 is the opening 7 having formed at its upper end the enlarged countersink 8, the use of whlch will appear as the description proceeds. lhe cooperating member of the clamp, which is designated generally by the numeral 9, comprises the frame 10 which is formed with the longitudinally extending slot 11, one edge of which is provided with a plurality of rack teeth 12. Formed at one end of the frame 10 is the enlargement 18 which is in turn formed with the jaw member 14 having the transversely extending slot 15 formed near the point where the jaw joins the body, which is of a width sufficient to receive the member 1.

Extending through the opening 7 and into the slot 11 is the gear 16, which is formed at its upper end with the enlargement 17 which is of a size sufficient to fit within the countersink 8. This enlargement forms a compression head for the gear, the use of which will appear as the description proceeds. Extending centrally through the gear is the shaft or rod 18 which is provided at its lower end with the flattened portion 19 and has formed therein the transverse aperture 20 for the reception of the pivot pin 21 by which the eccentric 22 is pivotally connected to the shaft. lhis eccentric 22 has formed thereon the hand lever 23 by which it is manipulated and is arranged to bear against the compression washer 21 which is formed with a central aperture to fit around the shaft 18 and has its edges inturned as at 25 so that the central portion of said washer will be spaced from the lower surface of the frame 10.

It will be apparent from the foregoing that in use the eccentric is thrown into the dotted-line position shown in Fig. 2, and in this way the handle will act as a lever by which the gear may be turned to tighten the jaws and clamp the same in place on a suitable article, and after the proper degree of tightness has been obtained, the eccentric is thrown into the position shown in the full lines in Fig. 2, so that the lever lies parallel with the under side of the frame 10 and it will be evident that the eccentric will engage the compression washer and cause the edges 25 thereof to bind the under side of the frame and simultaneously cause the compression head 17 of the gear to engage the faces of the countersink 8 and thereby lock the whole against movement.

From the foregoing it will be evident that a particularly simple and efficient clamp is provided which when adjusted to the proper )lace ma be firml locked a ainst accidental movement, thereby eliminating danger of the article or articles being clamped from becoming accidentally loosened.

\Vhile in the foregoing there has been shown and described the preferred embodiment of this invention, it is to be understood bination and arrangement of parts as will fall within the spirit and scope of the invention as claimed.

What is claimed is:

l. A clamp of the character described including a jaw frame, a jaw at one end of the jaw frame, said frame having an aperture near the jaw, a cooperating jaw frame having a longitudinal slot therein, a jaw carried by one end of the cooperating jaw frame, gear teeth formed on one side of the slot, a gear extending through the aperture in the first mentioned jaw frame and projecting through the slot and meshing with the teeth in the second mentioned frame, and means to rotate the gear and lock the gear against rotation after the proper adjustment has been obtained.

2. A clamp of the character described including a jaw frame having a countersunk aperture near one end, a jaw carried by the jaw frame, an enlargement formed at the jaw end of the frame, a guide bar secured beneath the enlargement, a eoiiperating jaw frame having a longitudinal slot therein, a jaw carried by one end of the cooperating jaw frame, the last mentioned jaw being apertured to receive the end of the first mentioned jaw frame opposite the first men- FRANK H. ROBINSON.

WVitnesses G. C. DAVIS, ELIZABETH VVATTs.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G. 

